MK1491-06STR IDT, Integrated Device Technology Inc, MK1491-06STR Datasheet - Page 5

• Manufacturer Part Number: MK1491-06STR
• Description: IC CLK SOURCE AMD GEODE 28-SOIC
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock/Frequency Synthesizerr

Specifications of MK1491-06STR

• Input: Crystal
• Output: LVCMOS
• Frequency - Max: 49MHz
• Voltage - Supply: 3.15 V ~ 3.45 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC
• Frequency-max: 49MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

External Components
The MK1491-06 requires some inexpensive external
components for proper operation. Decoupling capacitors of
0.1µF should be connected on each VDD pin to ground, as
close to the MK1491-06 as possible. A series termination
resistor of 33 may be used for each clock output. See the
discussion below for other external resistors required for
proper I/O operation. The 14.3 MHz oscillator has internal
caps that provide the proper load for a parallel resonant
crystal with CL=18 pF. For tuning with other values of C
formula 2*(C
should be connected between X1 and ground and X2 and
ground.
IDT™ / ICS™ AMD GEODE™ CLOCK SOURCE
MK1491-06
AMD GEODE™ CLOCK SOURCE
L
-18) gives the value of each capacitor that
L
, the
5
I/O Structure
The MK1491-06 provides more functionality in a 28-pin
package by using a unique I/O technique. The device
checks the status of all I/O pins during power-up and at exit
from the Power Down state. This status (pulled high, low, or
mid-level) then determines the frequency selections and
power down modes (see the tables on pages 2 and 4).
Within 10ms after power up, the inputs change to outputs
and the clocks start up. In the diagrams to the right, the 33
resistors are the normal output termination resistors. The
10k resistor pulls low to generate a logic zero. Weak
internal pull-up resistors are present on SEL24, EPCI#, FS,
LE#, PCISTP#, and SLOW#. These pins should be
connected directly to VDD or GND if not under active
control. Internal resistors on PEN, SEL AUDIO, and TS pull
to a mid-level (M).
*Note: Do not use a TTL load. This will overcome the 10 k
pull-down and force the input to a logic 1.
For select
= 0 (low)
I/O
10 k
Do not stuff for
33
“1” selection
MK1491-06
CLOCK SYNTHESIZER
To load*
REV L 051310